This would be better as "find the nth element of an array." Also, a column matrix doesn't exist. Perhaps you meant column vector, though the variables in your test cases are row vectors.
Duplicate each element of a vector.
Sum the numbers on the main diagonal
Replacing a row
UICBioE240 problem 1.18
Given the variable x as your input, multiply it by four, then divide it by two. Then put the result in y.
Find the last digit
Calculating selling price
find a specific element from an matrix
modulus of a number
Determine whether the input is divisible by 3 as well as 5
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